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In this reaction, none of the elements undergo a change in oxidation number or valency.

1. BaO2 + H2SO4 → BaSO4 + H2O2
2. The element undergo oxidation itself and reduces others is known as reducing agent. In this reaction O.N. of Ni changes from 0 to +2 and hence Ni acts as a reducing agent.
3. Lesser is the reduction potential greater is the reducing power.
4. Reducing power: K > Al > Cr > Ag

Correct answer: BaO2 + H2SO4 → BaSO4 + H2O2

Solution

In the reaction BaO2 + H2SO4 → BaSO4 + H2O2, no element undergoes a change in oxidation number, as all elements retain their oxidation states throughout the reaction.

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